The configuration of the outer planet that defines its quarter
The substance that mainly fills interstellar space
Distance from the equator along the meridian
The visible border of the illuminated and unlit parts of the moon
Unit of measurement of electrical charge
Geometric figure forming a space-time diagram
Constellation appearing above the horizon as the Earth rotates
Giant ocean wave caused by underwater earthquakes
The area in the sky from where the meteor shower comes
Superdense star
Scientist who determined the number of molecules in one mole of a substance
The process of overlapping a luminary by another celestial body
A shrinking star that threw off a shell of gas through an explosion